In their cities they have an open place or square dedicated to Freedom (Free Square they call it), where stand the palace and other public buildings. From this place all goods for sale are rigidly excluded, and all hawkers and hucksters with their yells and cries and vulgarities. They must go elsewhere, so that their clamour may not mingle with and mar the grace and orderliness of the educated classes. [4] This square, where the public buildings stand, is divided into four quarters which are assigned as follows: one for the boys, another for the youths, a third for the grown men, and the last for those who are past the age of military service. The law requires all the citizens to present themselves at certain times and seasons in their appointed places. The lads and the grown men must be there at daybreak; the elders may, as a rule, choose their own time, except on certain fixed days, when they too are expected to present themselves like the rest. Moreover, the young men are bound to sleep at night round the public buildings, with their arms at their side; only the married men among them are exempt, and need not be on duty at night unless notice has been given, though even in their case frequent absence is thought unseemly. [5] Over each of these divisions are placed twelve governors, twelve being the number of the Persian tribes. The governors of the boys are chosen from the elders, and those are appointed who are thought best fitted to make the best of their lads: the governors of the youths are selected from the grown men, and on the same principle; and for the grown men themselves and their own governors; the choice falls on those who will, it is hoped, make them most prompt to carry out their appointed duties, and fulfil the commands imposed by the supreme authority. Finally, the elders themselves have presidents of their own, chosen to see that they too perform their duty to the full.